According to Pan et al,11 a semi‐quantitative CT severity grading was derived for each of the 5 lobes, taking into account the extent of anatomic involvement: (0) indicates no involvement; (1) up to 5% involvement; (2) 5%‐25% involvement; (3) 26%‐50% involvement; (4) 51%‐75% engagement and (5) more than 75% involvement.
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